function s1_hello(){
echo "hello, world!"
}

function s2_tell_who_i_am(){
whoami
}

function s3_which_distro_do_i_use(){
cat /etc/os-release | grep NAME | head -n 1
}

function s4_view_my_cpu_arch(){
uname -m
}

function s5_show_first_scsi_disk_size(){
lsblk -l | \grep disk | \grep '^sda' |awk '{print $4}'|tr -d 'G'
}
function s6_show_main_memory_size_in_megabytes(){
free -m | grep "Mem:" | awk '{print $2}'
}
